My question is regarding the blue highlighted sentence. How does the calculation show that the derivative is the identity though? Shouldn't it be that if $X, Y = 0$, we have $\frac{d}{dt} \Phi(tX, 0)|_{t=0}=0$ instead?
2026-04-06 16:18:03.1775492283
Question about Thm 3.4.2 in Brian Hall's book in Lie Algebras
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